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The FBI has released previously unseen images of the Pentagon following the 9/11 terror attacks.

On Sept. 11, 2001, Al Qaeda terrorists hijacked American Airlines Flight 77 and crashed it into the Pentagon, one of four similar attacks that day. Two planes were flown into the World Trade Center in New York City, and another was retaken by passengers and crashed into a field in rural Pennsylvania.

The attack at the Pentagon killed 189 people: 125 in the building and 64 on the plane, including the five hijackers.

The newly released images, found on the bureau's FBI Records: The Vault site, show burning wreckage, cleanup efforts and investigators at the site.